Hi Jennifer, the supposed issue with high voltage wires and cancer is just that, not an ounce of real data to back it up. some bad studies promoted by people who don't know how to do science, and even less how to do statistics. Of course many other environmental issues are so very real, ground contaminationof many sorts and led paint, but most of those should be covered by any good inspector.
About the only disadvantage I think might be real to living anywhere near high voltage transmission lines is the possibility of electrical noise should you be a short wave radio enthusiast, or a ham operator. Even then as long as lines are well maintained shouldn't be a big deal. Tom Net-Tamer V 1.13 Beta - Registered